If we read what McPherson wrote in context we see he was talking about a slave-labor based, agrarian economy as what was endangered. McPherson was saying southerners wanted to stay rooted in the past and didn't want to progress into the future. Here's what he had to say just prior to the quotation you excerpted: "From a broader perspective it may have been the North that was exceptional and unique before the Civil War. The South more closely resembled a majority of the societies of the world than did the rapidly changing North during the antebellum generation. Despite the abolition of legal slavery or serfdom throughout much of the western hemisphere and western Europe, most of the world--like the South--had an unfree or quasi-free labor force. Most societies in the world remained predominantly rural, agricultural, and labor-intensive; most, including even several European countries, had illiteracy rates as high or higher than the South's 45 percent; most like the South remained bound by traditional values and networks of family, kinship, hierarchy, and patriarchy. The North--along with a few countries of northwestern Europe--hurtled forward eagerly toward a future of industrial capitalism that many southerners found distasteful if not frightening; the South remained proudly and even defiantly rooted in the past before 1861." [James M. McPherson, Battle Cry of Freedom: The Civil War Era, p. 860]
Baloney. That claim is not supported by what McPherson wrote.